PHP : 1 week is not always 7 days: $_1week = new DateInterval("P1W"); $_7days = new DateInterval("P7D"); var_dump($_1week == $_7days); // true var_dump

PHP : 1 week is not always 7 days: $_1week = new DateInterval("P1W"); $_7days = new DateInterval("P7D"); var_dump($_1week == $_7days); // true var_dump($_1week); var_dump($_1week == $_7days); // false var_dump($_7days); var_dump($_1week == $_7days); // true http://3v4l.org/CcAk8 http://3v4l.org/CcAk8 Same result with '$_1week = new DateInterval("P7D");' :-)